Deadbolt lock



N. A. WELCH DEADBOLT LOCK March 27, 1962 Filed Oct. 6, 1959 8 H 5 m mm W Z W 6 I W, s fl m 0 N U m i ww a l 45 0 f 4.. Jr W M W 5 5 am w o ll i Aw HTTOFPNEY.v

United States Patent Ofilice 15,26,703 Patented Mar. 27, 1962 3,026,703 DEADBOLT LOK Nicholas A. Welch, West Hartford, Conn, assignor to The American Hardware Corporation, New Britain, Conn, a corporation of Connecticut Filed Oct. 6, 1959, Ser. No. 844,674 4 Claims. (Cl. 70-134) This invention relates to a deadbolt lock for doors and more particularly to improvements in locks of the type shown in the copending application which I filed jointly with Charles Wolf on May 17, 1957, under Serial No. 659,820 and which is now Patent No. 2,936,606, issued May 17, 1960.

The primary object of this invention is to provide a deadbolt lock which is especially adapted for use in narrow, tubular door frames such as those constructed of extruded aluminum sections.

A further object of this invention is to provide a dead locking mechanism for the bolt of such a lock which is well suited for use in the narrow casing of the lock, consists of relatively few and easily assembled parts and yet provides an extremely high degree of security.

A still further object of this invention is to provide a deadbolt lock which is adapted for operation by keycontrolled lock cylinders produced by different manufacturers and which might, therefore, have cam members of different lengths.

Further objects and advantages of this invention will be more clearly understood from the following description and accompanying drawing in which:

FIG. 1 is an elevational front view of a lock embodying the present invention.

PEG. 2 is a side view of said lock, partly in central vertical section.

FIG. 3 is an elevational rear view thereof.

FIG. 4 is a. fragmentary sectional side view, similar to P16. 2, showing the bolt of the lock in projected or deadlocked position.

FIG. 5 is a fragmentary front view partly in section on line 5-5 of FIG. 4.

FIG. 6 is an elevational plan View of the bolt and deadlocking plunger.

FIG. 7 is an elevational side view thereof.

Referring now to the drawing, the numeral 5 denotes a narrow, vertically elongated, lock casing which is preferably formed so that it may be cut to the required depth from an extruded bar having the cross-sectional configuration shown. Said casing has a chamber 6 extending therethrough and sidewalls 77 at the opposite sides of said chamber which contain opposed, horizontal grooves 88 that form a guideway for slidably guiding a reciprocable locking bolt 9 between retracted and projected positions.

The casing 5 has a face plate 10 secured to its front edge by screws 10a10a, and said face plate has an opening 10b therein through which the locking bolt 9 slides. The casing and its face plate may be mounted in a hollow tubular door frame, not shown, by jackscrews 1111 in the manner fully described in my copending application, Serial No. 644,590, filed March 7, 1957, and now Patent No. 2,919,571, issued January 5, 1960.

The bolt 9 is rectangular in shape and contains a transverse notch 12 in the rear portion of its upper edge. A centrally located hole 13 extends vertically from the bottom of said notch to the lower edge of said bolt, and the lower portion 13a of said hole is of reduced diameter and slidably receives a vertically reciprocable plunger 14 which is circular in cross-section and projects from the lower edge of the bolt. Said plunger has a rectangular head 15 secured to its upper end which is slidable in the notch 12 and prevents rotation of the plunger. At its lower exterior end, said plunger carries a deadlocking pin 16 which extends transversely through a hole therein and projects from its opposite sides into aligned horizontal slots 17-17 formed in the sidewalls 77 of the lock casing. Vertically extending detent notches 17a and 17b respectively, are formed in the upper edge of each slot at its inner and outer ends and said detent notches are configured to receive the opposite end portions of the deadlocking pin 16. Said pin is normally biased toward said detent notches by a compression spring 18 which surrounds the plunger 14 and is disposed between the bottom of the hole 13 and the underside of the head 15 as shown in FIGS. 2, 4 and 5. The inner detent notches 17a terminate substantially in the plane of the lower edge of the bolt 9 and receive the deadlocking pin 16 when the bolt is in retracted position, as shown in FIG. 2, to prevent accidental movement of the bolt to projected position.

In the disclosed embodiment of the present invention, the bolt actuating means comprise a pair of lock cylinders 19 and 20 which are threaded into coaxial holes in the sidewalls 77 of the lock casing. The lock cylinders are of the conventional type well known to those skilled in the art and form no part of the present invention, but it may be stated that said cylinders include rotatable key-plugs having bolt operating earns 21 and 22 of the usual type secured to the inner ends thereof.

Referring now to FIG. 2 of the drawing, it will be seen that when the key-plug of the lock cylinder 19 is rotated with the proper key to turn the cam 21 in a clockwise direction, the free end of said cam will first engage the head 15 of the plunger 14, as shown in dotted lines, and will then force said plunger downwardly to move the deadlocking pin 16 out of the detent notches 17a and into alignment with the horizontal slots 17. Upon continued rotation of the key-plug, the free end of the cam 21 will engage the forward side of the notch 12 and urge the bolt outwardly toward its projected or locking position. As the bolt moves toward projected position, the plunger 14 will be held down by the cam 21 and the deadlocking pin 16 will pass through the horizontal slots 17. When the cam passes dead center position and starts on its upward swing, the spring 18, which causes the plunger to follow the cam, will urge the plunger upwardly so that as the bolt reaches fully projected position, the deadlocking pin 16 will enter the outer detent notches 17b as shown in FIGS. 4 and 5. Further rotation of the key-plug will carry the cam out of the notch 12 and back to its normal position to permit withdrawal of the key. The bolt may also be moved to projected position in the same manner by the cam 22, and it will also be evident that either cam may be used to move the bolt from projected to retracted position, in which case the mechanism will operate just the reverse of that above described.

Referring particularly to FIGS. 2, 5 and 7, it will be seen that the outer detent notches 17]) extend above the lower edge of the bolt 9 and that said bolt contains aligned, transversely extending recesses 23-23 in its lower edge at diametrically opposite sides of the hole 13a therein. When the bolt is in projected position, as shown in FIGS. 4 and 5, the recesses 23-23 are aligned with the detent notches 17b so that the deadlocking pin 16 may enter both the notches and the recesses to thereby directly lock the bolt 9 to the casing 5. As a result, any inward pressure applied to the bolt by unauthorized persons attempting to force the lock will be resisted by the casing 5 directly through the pin 16 and not through the plunger 14 which merely serves to hold the pin in position.

Portions of the adjacent edges of the detent notches 17a and 17b in the sidewalls of the lock casing are oppositely inclined, as shown in FIGS. 2 and 4, to provide cam surfaces 17c and 17d which extend from the slots 17 to the detent notches 17a and 17b and act to guide the deadlocking pin thereinto should it not be properly aligned with said detent notches on movement of the bolt to retracted or projected positions. As a result, lock cylinders which are produced by different manufacturers and have cams which are shorter than those shown may be used in the lock. Although the travel of the bolt will be less when a shorter cam is used, the bolt will normally be urged to its fully retracted or projected position and the pin 16 properly seated in its respective detent notches through engagement of the pin 16 with the cam surfaces 170 or 17d under the influence of the spring 18.

It is evident from FIG. 4 that the bolt 9 must move to its fully projected position before the deadlocking pin 16 can enter the detent notches 17b. If, due to some abnormal condition, full projection of the bolt is prevented, the deadlocking pin 16 will come to rest on the cam surfaces 17d below the detent notches 17b. In order to prevent depression of the bolt to its retracted position under such circumstances, I provide each of said cam surfaces 17d with a vertically disposed portion 17e at its lower end as best shown in FIGS. 2 and 4. These vertical portions provide secondary stop surfaces which, when engaged by the deadlocking pin during an attack on the lock, will prevent further movement of the bolt.

In order to assemble the lock, it is only necessary to insert the plunger 14 and the spring 18 into the bolt 9 and then slide the bolt into the casing from either edge thereof. The plunger is then depressed until the transverse hole in its lower end is aligned with the slots 1717, after which the pin 16 may be inserted into said hole through one of said slots. In addition to performing its deadlocking function, the pin 16, through its engagement with the ends of the slots 1717, also retains the bolt in the casing and therefore eliminates the need of separate retaining means such as provided in locks of this type heretofore produced.

I claim:

1. A lock including a casing having spaced side walls defining a chamber therein, a bolt reciprocably mounted in said chamber for horizontal movement between projected and retracted positions, said side walls having transversely aligned slots therein extending parallel to the direction of movement of said bolt and terminating inwardly of the edges of said side walls whereby the opposite ends of said slots are closed to provide abutment surfaces, a plunger mounted in said bolt for vertical reciprocal movement between deadlocking and non-deadlocking positions and having a hole extending transversely therethrough that is alignable with said slots, a deadlocking pin adapted for insertion through one of said slots into said hole and when positioned therein having its opposite end portions projecting into said slots for engagement with said abutment surfaces to retain the bolt in said casing, each of said slots having a detent notch in one edge thereof configured to receive the adjacent end portion of said deadlocking pin when said bolt is in projected position to thereby deadlock said bolt, a cam rotatably mounted on said casing for moving said plunger out of deadlocking position and said bolt between its retracted and projected portions, and a spring yieldingly urging said plunger toward deadlocking position.

2. A lock including a casing having spaced sidewalls defining a chamber therein, a bolt reciprocably mounted in said chamber for movement in a horizontal direction between retracted and projected positions, said bolt having a transverse notch in its upper edge and a hole extending vertically from the bottom of said notch to the lower edge of said bolt, a plunger slidably mounted in said hole and having one end projecting below said lower edge of the bolt and containing a transverse hole, said sidewalls having aligned slots therein extending parallel to the direction of movement of said bolt, a deadlocking pin extending through said hole in the plunger and having its opposite end portions projecting into said slots, each of said slots having a vertically extending detent notch in the upper edge thereof configured to receive the adjacent end portion of said deadlocking pin in the projected position of said bolt whereby to deadlock said bolt, a cam rotatably mounted on said casing for moving said plunger to disengage said pin from said detent notches and for moving said bolt between retracted and projected positions, and a spring contained within said hole normally biasing said plunger into deadlocking position.

3. The subject matter set forth in claim 2 wherein said lower edge of the bolt contains transversely extending recesses at opposite sides of said plunger, said recesses and said detent notches being aligned when said bolt is in its projected position and adapted to receive said deadlocking pin whereby said bolt is deadlocked to said casing directly by said pin.

4. A lock including a casing having spaced side Walls defining a chamber therein, a bolt reciprocably mounted in said chamber for movement in a horizontal direction from an inner retracted position to an outer projected position, at least one of said side walls having a horizontal slot therein communicating with said chamber, a plunger mounted in said bolt for vertical reciprocable movement between deadlocking and non-deadlocking positions, a deadlocking member extending transversely from said plunger into said slot, said slot having a vertically disposed notch in an edge thereof terminating in a detent portion configured to receive the end portion of said deadlocking member in the projected position of Said bolt whereby to deadlock said bolt in projected position, the inner edge of said notch being formed to provide a vertical portion extending from the edge of said slot and an upwardly and outwardly inclined portion extending from said vertical portion to the detent portion of said notch to provide a cam surface for guiding said deadlocking member thereinto, said vertical portion of said inner edge being engageable by said deadlocking member upon depression of said bolt from a partially projected position and when so engaged preventing further depression of said bolt, a cam rotatably mounted on said casing for moving said plunger to nondeadlocking position and for moving said bolt between retracted and projected positions and a spring urging said plunger toward deadlocking position and into engagement with said cam.

References Cited in the file of this patent UNITED STATES PATENTS 480,973 Sparks Aug. 16, 1892 2,616,738 Jewett Nov. 4, 1952 2,696,728 Jewett et al Dec. 14, 1954 2,936,606 Welch et al May 17, 1960 

